gBrowser.mPanelContainer.addEventListener('DOMContentLoaded', function({target: doc}){
  var count = gBrowser.tabContainer.childNodes.length;
  if (gBrowser.currentURI.spec == 'about:blank' && count == 1) {
    doc.location.href = "file:///E:/Firefox/FastDial/FastDial.html";
  }
},false);